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access icon openaccess Bidirectional marx DC–DC converter for offshore wind farm application

This is an open access article published by the IET under the Creative Commons Attribution -NonCommercial License (http://creativecommons.org/licenses/by-nc/3.0/)
Received 25/06/2018, Accepted 31/07/2018, Published 22/01/2019

The bidirectional DC–DC converter explained here is based on the Marx principle and is capable of achieving step-up and step-down voltage transformations at kV level and is able to handle MW-level power transfers in both directions. The main features of this topology are the absence of a high-frequency transformer, reduced weight, volume, and soft switching to reduce the switching losses. In the boost mode, five capacitors are charged in parallel and discharged in series to achieve the step-up action, and in the buck mode, the converse action takes place. The operating principle is explained, and the steady-state analysis of the converter is given. Matlab/Simulink simulation of a 50 MW converter, interfacing 6 kV, and 30 kV systems supports and validates the theoretical analysis, enables positive supporting the conclusions to be made.

Inspec keywords: DC-DC power convertors; power capacitors; offshore installations; wind power plants

Other keywords: offshore wind farm application; steady-state analysis; MW-level power transfers; power 50.0 MW; voltage 6.0 kV; boost mode; Matlab-Simulink simulation; voltage 30.0 kV; voltage transformations; switching losses reduction; bidirectional Marx DC–DC converter

Subjects: Wind power plants; Other power apparatus and electric machines; DC-DC power convertors

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